On Thu, Sep 08, 2022 at 07:41:53PM +0800, Hamilton Alex wrote: > ptp4l[130171.662]: rms 1 max 2 freq -49 +/- 3 delay 9058 +/- 0
> my board has 1PPS output, I connect it to the master and compared with > reference PPS. > however, the 1pps time error is around 40 NS, which means my board is > ahead of the reference for about 40NS, which doesn't match the result > dumped by ptp4l. ptp4l is just printing the measured offset. It doesn't know the actual error. A measured delay of 9 microseconds is huge. That's few kilometers of cable. What hardware do you use? Does it have PHY or MAC timestamping, and are those errors compensated? -- Miroslav Lichvar _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
